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Method for low-temperature diffusion welding of tungsten and low-activation steel

A low-activation steel, diffusion welding technology, used in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as unfavorable joints, slow release, and reduce joints, to improve diffusion coefficient, reduce diffusion activation energy, reduce damage effect

Pending Publication Date: 2021-11-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the tungsten / low-activation steel joints with certain connection strength and plasticity have been obtained by using these four kinds of intermediate layers, but there are still deficiencies: 1) The intermediate layer reacts with the base metal to form a brittle reaction layer during the diffusion process, which is not conducive to the improvement of joint strength. 2) Diffusion welding temperature is generally as high as 900-1050°C, which is not conducive to the slow release of joint residual stress
In addition, if the diffusion welding temperature is too high (760°C higher than the tempering temperature of low-activation steel), it will also cause plastic deformation and grain growth of the low-activation steel itself, which will reduce the mechanical properties of the joint and the low-activation steel body, and affect the subsequent usage of

Method used

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  • Method for low-temperature diffusion welding of tungsten and low-activation steel
  • Method for low-temperature diffusion welding of tungsten and low-activation steel
  • Method for low-temperature diffusion welding of tungsten and low-activation steel

Examples

Experimental program
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Embodiment 1

[0024] A method for low-temperature diffusion welding of tungsten and low-activation steel, comprising: performing severe plastic deformation treatment on the surface of the low-activation steel to refine the surface and near-surface grain size to the nanometer level, and obtain the low-activation steel with modified surface structure ; Diffusion welding is used to weld tungsten and surface structure modified low-activation steel.

[0025] Among them, the specific process of performing severe plastic deformation on the surface of low-activation steel is as follows:

[0026] 1) Cut the low activation steel into For the cylinder, use SiC sandpaper of different meshes to polish the upper and lower surfaces and sides and then polish to obtain a smooth surface with a surface roughness Ra≤5μm;

[0027] 2) Put the polished low-activation steel into absolute ethanol for ultrasonic cleaning for 10 minutes, and then dry it;

[0028] 3) Select two ball milling tanks with an inner diam...

Embodiment 2

[0040] This embodiment is the same as the embodiment 1, the only difference is that the diffusion connection temperature is 850°C.

Embodiment 3

[0042] The specific process of carrying out the severe plastic deformation treatment on the surface of the low-activation steel is the same as that in Example 1.

[0043] A method for low-temperature diffusion welding of tungsten and low-activation steel, comprising the following steps:

[0044] 1) Process pure tungsten and low-activation steel with surface structure modification into 8mm×9mm×8mm blocks;

[0045] 2) Use SiC sandpaper of different meshes to grind and polish the surface to be welded of tungsten and low-activation steel to a surface roughness Ra≤5μm;

[0046] 3) Put the above-mentioned polished tungsten and low-activation steel into acetone in turn for ultrasonic cleaning for 10 minutes, wipe the surface of tungsten and low-activation steel to be welded with absolute ethanol and blow dry;

[0047] 4) Put the combination of tungsten / low-activation steel in the graphite mold, and then put the graphite mold with the sample to be welded into the vacuum hot-press fur...

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Abstract

The invention discloses a method for low-temperature diffusion welding of tungsten and low-activation steel. The method comprises the following steps: carrying out surface severe plastic deformation treatment on the low-activation steel to refine the grain sizes of the surface and near surface of the low-activation steel to nanoscale to obtain surface structure modified low-activation steel; and tungsten and the surface structure modified low-activation steel are welded through a diffusion welding method. By means of the method, high-strength connection of tungsten and the low-activation steel can be achieved near the tempering temperature of the low-activation steel, the excellent tensile strength of a connector is guaranteed, meanwhile damage to the mechanical property of a low-activation steel body in the existing diffusion welding process is reduced, and an obtained tungsten and low-activation steel connecting piece can be used at high temperature.

Description

technical field [0001] The invention belongs to the technical field of metal material connection, in particular to a method for low-temperature diffusion welding of tungsten and low-activation steel. Background technique [0002] The magnetic confinement nuclear fusion reactor test device is one of the main devices for obtaining controlled thermonuclear fusion energy. In the device, the divertor and the first wall in the experimental cladding module directly face the high-temperature plasma, protecting the vacuum chamber wall from the plasma The bombardment of the body plays an important role in the steady-state operation of the fusion reaction and the safety of the device. In order to meet complex and harsh working conditions, the above-mentioned plasma-facing components are usually composed of plasma-facing materials, heat sink materials and structural materials. Tungsten and its alloys have the advantages of high melting point, high thermal conductivity, low vapor pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02
CPCB23K20/026
Inventor 钟志宏王春艳高峰林俐菁吴玉程
Owner HEFEI UNIV OF TECH
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